Cisco Security Advisory
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AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
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A vulnerability in the firewall implementation of Cisco Identity Services Engine could allow an unauthenticated, remote attacker to cause high CPU utilization and possibly the crash of some internal processes.
The vulnerability is due to insufficient implementation of the firewall rule to protect some open ports. An attacker could exploit this vulnerability by flooding the affected system with malformed IP packets.
Cisco has confirmed this vulnerability in a security notice and software updates are available.
To exploit the vulnerability the attacker may need access to trusted internal networks to be able to send large amounts of malformed IP packets to the targeted system. This access requirement may limit the likelihood of a successful exploit.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
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Customers should refer to Cisco bug ID CSCug94572 for the most complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco Identity Services Engine Software versions 1.1 and prior were vulnerable. Later versions of Cisco Identity Services Engine Software may also be affected.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
To mitigate denial of service attacks, apply hardware rate limiter features to limit packets that require CPU processing. See vendor documentation for specific configuration instructions. For hardware rate limiting configuration details, see Cisco Catalyst 6500 Denial of Service (DoS) Protection Configuration Guide.
Administrators are advised to monitor affected systems.
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Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com for assistance.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2013-Jul-25
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